package reggie.filter;

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import reggie.common.BaseContext;
import reggie.common.R;
import reggie.entity.User;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class loginCheckFilter implements Filter {
    //工具类 路径配置(支持通配符)
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        //设置不需要拦截的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/page/login/login.html",
                "/backend/api/**",
                "/backend/images/**",
                "/backend/js/**",
                "/backend/plugins/**",
                "/backend/styles/**",
                "/front/**",
                "/backend/page/login/**",
                "/user/sendMsg",
                "/user/login"
        };
        log.info(requestURI);
        //2.判断本次请求是否需要处理
        boolean res = check(urls, requestURI);
        //3.如果不需要处理，则直接放行
        if (res) {
            //放行
            filterChain.doFilter(request, response);
            return;
        }
        //4.判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            //放行
            filterChain.doFilter(request, response);
            return;
        }

        //用户登录放行
        if (request.getSession().getAttribute("user") != null) {

            Long userId = ((User) request.getSession().getAttribute("user")).getId();
            BaseContext.setCurrentId(userId);

            //放行
            filterChain.doFilter(request, response);
            return;
        }

        //5.如果未登录则返回未登录结果
        //用输出流的方式传到客户端  转JSON很重要
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        response.sendRedirect("/backend/page/login/login.html");
        return;
    }

    /**
     * 设置匹配路径方法
     *
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
